On this mainboard the 68020 is replaced by a 68030. While the machine isnt' any faster (since the somewhat bigger cache cannot be used) you can find 68030 with higher clock rates easier. This helps a lot if you want to overclock the machine; you don't need a cooling device.

On this high resolution view you can see the solder pad besides the 68020, where a socket for the 68030 fits nicely.